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vendor/k8s.io/kubernetes/cluster/addons/fluentd-elasticsearch/README.md

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+# Elasticsearch Add-On
+
+This add-on consists of a combination of [Elasticsearch][elasticsearch],
+[Fluentd][fluentd] and [Kibana][kibana]. Elasticsearch is a search engine
+that is responsible for storing our logs and allowing for them to be queried.
+Fluentd sends log messages from Kubernetes to Elasticsearch, whereas Kibana
+is a graphical interface for viewing and querying the logs stored in
+Elasticsearch.
+
+**Note:** this addon should **not** be used as-is in production. This is
+an example and you should treat it as such. Please see at least the
+[Security](#security) and the [Storage](#storage) sections for more
+information.
+
+## Elasticsearch
+
+Elasticsearch is deployed as a [StatefulSet][statefulSet], which is like
+a Deployment, but allows for maintaining state on storage volumes. 
+
+### Security
+
+Elasticsearch has capabilities to enable authorization using the
+[X-Pack plugin][xPack]. See configuration parameter `xpack.security.enabled`
+in Elasticsearch and Kibana configurations. It can also be set via the
+`XPACK_SECURITY_ENABLED` env variable. After enabling the feature,
+follow [official documentation][setupCreds] to set up credentials in
+Elasticsearch and Kibana. Don't forget to propagate those credentials also to
+Fluentd in its [configuration][fluentdCreds], using for example
+[environment variables][fluentdEnvVar]. You can utilize [ConfigMaps][configMap]
+and [Secrets][secret] to store credentials in the Kubernetes apiserver.
+
+### Initialization
+
+The Elasticsearch StatefulSet manifest specifies that there shall be an
+[init container][initContainer] executing before Elasticsearch containers
+themselves, in order to ensure that the kernel state variable
+`vm.max_map_count` is at least 262144, since this is a requirement of
+Elasticsearch. You may remove the init container if you know that your host
+OS meets this requirement.
+
+### Storage
+
+The Elasticsearch StatefulSet will use the [EmptyDir][emptyDir] volume to
+store data. EmptyDir is erased when the pod terminates, here it is used only
+for testing purposes. **Important:** please change the storage to persistent
+volume claim before actually using this StatefulSet in your setup!
+
+## Fluentd
+
+Fluentd is deployed as a [DaemonSet][daemonSet] which spawns a pod on each
+node that reads logs, generated by kubelet, container runtime and containers
+and sends them to Elasticsearch.
+
+**Note:** in order for Fluentd to work, every Kubernetes node must be labeled
+with `beta.kubernetes.io/fluentd-ds-ready=true`, as otherwise the Fluentd
+DaemonSet will ignore them.
+
+Learn more in the [official Kubernetes documentation][k8sElasticsearchDocs].
+
+### Known problems
+
+Since Fluentd talks to the Elasticsearch service inside the cluster, instances
+on masters won't work, because masters have no kube-proxy. Don't mark masters
+with the label mentioned in the previous paragraph or add a taint on them to
+avoid Fluentd pods scheduling there.
+
+[fluentd]: http://www.fluentd.org/
+[elasticsearch]: https://www.elastic.co/products/elasticsearch
+[kibana]: https://www.elastic.co/products/kibana
+[xPack]: https://www.elastic.co/products/x-pack
+[setupCreds]: https://www.elastic.co/guide/en/x-pack/current/setting-up-authentication.html#reset-built-in-user-passwords
+[fluentdCreds]: https://github.com/uken/fluent-plugin-elasticsearch#user-password-path-scheme-ssl_verify
+[fluentdEnvVar]: https://docs.fluentd.org/v0.12/articles/faq#how-can-i-use-environment-variables-to-configure-parameters-dynamically
+[configMap]: https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/
+[secret]: https://kubernetes.io/docs/concepts/configuration/secret/
+[statefulSet]: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset
+[initContainer]: https://kubernetes.io/docs/concepts/workloads/pods/init-containers/
+[emptyDir]: https://kubernetes.io/docs/concepts/storage/volumes#emptydir
+[daemonSet]: https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
+[k8sElasticsearchDocs]: https://kubernetes.io/docs/tasks/debug-application-cluster/logging-elasticsearch-kibana
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/cluster/addons/fluentd-elasticsearch/README.md?pixel)]()